question vs solution

question

noun
  • A sentence, phrase or word which asks for information, reply or response; an interrogative. 

  • A subject or topic for consideration or investigation. 

  • A proposal to a meeting as a topic for deliberation. 

  • A doubt or challenge about the truth, accuracy, or validity of a matter. 

verb
  • To ask a question or questions; inquire or seek to know; examine. 

  • To ask questions of; to interrogate; to ask for information. 

  • To raise doubts about; have doubts about. 

solution

noun
  • An act, plan or other means, used or proposed, to solve a problem. 

  • A homogeneous mixture, which may be liquid, gas or solid, formed by dissolving one or more substances. 

  • An answer to a problem. 

  • A product, service or suite thereof, especially software. 

  • The act of dissolving, especially of a solid by a fluid; dissolution. 

verb
  • To treat with a solution. 

How often have the words question and solution occurred in a corpus of books? (source: Google Ngram Viewer )